2. To establish a returnable spring on the top part of the case of the lock. On the locks intended for the left doors, spring pads should be visible to the left of apertures for moisture removal (if to look from above). On the locks intended for the right doors, spring pads should be located to the right of apertures for moisture removal, fig. the Arrangement of a returnable spring.

3. To establish on the cylinder of the lock an arm so that its lever has been turned to the left on locks for the left doors and – to the right on the locks intended for the right doors. The prevention

Arms can differ colour: white for locks of the left doors and black for locks of the right doors.